TY - GEN
T1 - Modified staircase modulation with low input current distortion for multicell converters
AU - Pérez, Marcelo
AU - Kouro, Samir
AU - Rodríguez, José
AU - Wu, Bin
PY - 2008
Y1 - 2008
N2 - Cascaded H Bridge Multilevel Inverters are traditionally controlled using Phase Shifted PWM. This method allows an even power distribution among the different cells of the converter, which enables input current harmonic cancelations due to the isolation multipulse transformer and rectifier system. For high power applications a selective harmonic elimination based method, also known as staircase modulation, has been proposed. This method is devised to reduce switching losses to a minimum, improving the efficiency of the converter. The switching angles are calculated to eliminate low order harmonics at the output voltage. However, this method does not provide even power distribution among the cells, avoiding the input current harmonic cancelation. This work proposes a redistribution of the switching angles between the cells, maintaining the overall switching pattern of the staircase modulation. The methods maintains the harmonic elimination characteristic at the output voltage, while improving the power distribution and consequently the input current harmonic performance. Mathematical analysis and simulation results are presented to support the strategy.
AB - Cascaded H Bridge Multilevel Inverters are traditionally controlled using Phase Shifted PWM. This method allows an even power distribution among the different cells of the converter, which enables input current harmonic cancelations due to the isolation multipulse transformer and rectifier system. For high power applications a selective harmonic elimination based method, also known as staircase modulation, has been proposed. This method is devised to reduce switching losses to a minimum, improving the efficiency of the converter. The switching angles are calculated to eliminate low order harmonics at the output voltage. However, this method does not provide even power distribution among the cells, avoiding the input current harmonic cancelation. This work proposes a redistribution of the switching angles between the cells, maintaining the overall switching pattern of the staircase modulation. The methods maintains the harmonic elimination characteristic at the output voltage, while improving the power distribution and consequently the input current harmonic performance. Mathematical analysis and simulation results are presented to support the strategy.
UR - http://www.scopus.com/inward/record.url?scp=52349112936&partnerID=8YFLogxK
U2 - 10.1109/PESC.2008.4592235
DO - 10.1109/PESC.2008.4592235
M3 - Conference contribution
AN - SCOPUS:52349112936
SN - 9781424416684
T3 - PESC Record - IEEE Annual Power Electronics Specialists Conference
SP - 1989
EP - 1994
BT - PESC '08 - 39th IEEE Annual Power Electronics Specialists Conference - Proceedings
T2 - PESC '08 - 39th IEEE Annual Power Electronics Specialists Conference
Y2 - 15 June 2008 through 19 June 2008
ER -